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Cell Growth & Differentiation, Vol 8, Issue 2 179-186, Copyright © 1997 by American Association of Cancer Research


ARTICLES

Transactivation through Ets and Ap1 transcription sites determines the expression of the tumor-suppressing gene maspin

M Zhang, N Maass, D Magit and R Sager
Dana-Farber Cancer Institute, Boston, Massachusetts, USA.

Tumor invasion and metastasis are processes poorly understood at the molecular level. Maspin is a serine protease inhibitor (serpin) with tumor-suppressing function in the mammary gland. Maspin gene expression is decreased with malignancy and is lost in metastatic cells. We show in this report that differential expression of maspin in normal and carcinoma-derived mammary epithelial cells is regulated at the transcriptional level. We have identified the Ets and Ap1 sites in the maspin promoter that are active in regulating maspin expression in normal mammary epithelial cells but inactive in tumor cells. The Ets site alone is sufficient to activate transcription in a heterologous promoter, whereas the Ap1 site cooperates with Ets in activation. The enhancing function by Ets and Ap1 elements is decreased in primary tumor cells (21NT) and is abolished in invasive tumor cells (MDA-231). Thus, loss of maspin expression during tumor progression results at least in part from the absence of transactivation through the Ets and Ap1 sites.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1997 by the American Association of Cancer Research.